This test verifies the position and size of the highlight rectangles overlayed on an SVG root element.

svg-root: {
  "paths": [
    {
      "path": ["M", 30, 30, "L", 130, 30, "L", 130, 130, "L", 30, 130, "Z"],
      "fillColor": "rgba(255, 0, 0, 0)",
      "outlineColor": "rgba(128, 0, 0, 0)"
    },
    {
      "path": ["M", 15, 15, "L", 145, 15, "L", 145, 145, "L", 15, 145, "Z"],
      "fillColor": "rgba(0, 255, 0, 0)"
    },
    {
      "path": ["M", 5, 5, "L", 155, 5, "L", 155, 155, "L", 5, 155, "Z"],
      "fillColor": "rgba(0, 0, 255, 0)"
    },
    {
      "path": ["M", 0, 0, "L", 160, 0, "L", 160, 160, "L", 0, 160, "Z"],
      "fillColor": "rgba(255, 255, 255, 0)"
    }
  ],
  "showRulers": true,
  "showExtensionLines": true
}